I am moving the network protocol library to the Airplay SDK , you can look at it. I know a few "big names" that use it to develop games for iOS / Android (due to the NDA, I cannot disclose the names).
The APIs presented are all fine (in the past, there were several bugs in the socket APIs). The tools are a little rough, but as soon as you set up a project, it is more or less acceptable. Unfortunately, I have no experience with the Airplay 3D APIs, you will need to verify this yourself.
The list of target platforms is impressive - iOS, Android, Bada, Symbian, Windows Mobile. You can use Mac and Xcode or Windows and Visual Studio for development.
Please note that this is a commercial toolkit, but there is a free evaluation version. I think you should try it yourself!
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